John Romero's Daikatana (also known as simply Daikatana) is a science-fiction/fantasy first-person shooter developed by Ion Storm and published by Eidos.

Players control Hiro Miyamoto, a martial arts instructor in a futuristic, dystopian Japan (set in 2455 A.D.) where the world is run by powerful corporations (the most powerful owned by the ruthless Kage Mishima). After learning from a feeble old man (Toshiro Ebihara) that the current timeline is actually an alternate timeline after Kage has taken control of the Daikatana (a powerful, magical sword that allows its wielder to travel through time), Hiro (along with Toshiro's daughter Mikiko and a mercenary named Superfly Johnson) must recover the sword and, while traveling throuhg time, return Earth to its normal state.